pyaudviz/components/text.py

from PIL import Image, ImageDraw
from PyQt4.QtGui import QPainter, QColor, QFont
from PyQt4 import uic, QtGui, QtCore
from PIL.ImageQt import ImageQt
import os
import io
from . import __base__


class Component(__base__.Component):
    '''Title Text'''

    modified = QtCore.pyqtSignal(int, dict)

    def __init__(self, *args):
        super().__init__(*args)
        self.titleFont = QFont()

    def widget(self, parent):
        height = int(parent.settings.value('outputHeight'))
        width = int(parent.settings.value('outputWidth'))

        self.parent = parent
        self.textColor = (255, 255, 255)
        self.title = 'Text'
        self.alignment = 1
        self.fontSize = height / 13.5
        fm = QtGui.QFontMetrics(self.titleFont)
        self.xPosition = width / 2 - fm.width(self.title)/2
        self.yPosition = height / 2 * 1.036

        page = uic.loadUi(os.path.join(
            os.path.dirname(os.path.realpath(__file__)), 'text.ui'))
        page.comboBox_textAlign.addItem("Left")
        page.comboBox_textAlign.addItem("Middle")
        page.comboBox_textAlign.addItem("Right")

        page.lineEdit_textColor.setText('%s,%s,%s' % self.textColor)
        page.pushButton_textColor.clicked.connect(self.pickColor)
        btnStyle = "QPushButton { background-color : %s; outline: none; }" \
            % QColor(*self.textColor).name()
        page.pushButton_textColor.setStyleSheet(btnStyle)

        page.lineEdit_title.setText(self.title)
        page.comboBox_textAlign.setCurrentIndex(int(self.alignment))
        page.spinBox_fontSize.setValue(int(self.fontSize))
        page.spinBox_xTextAlign.setValue(int(self.xPosition))
        page.spinBox_yTextAlign.setValue(int(self.yPosition))

        page.fontComboBox_titleFont.currentFontChanged.connect(self.update)
        page.lineEdit_title.textChanged.connect(self.update)
        page.comboBox_textAlign.currentIndexChanged.connect(self.update)
        page.spinBox_xTextAlign.valueChanged.connect(self.update)
        page.spinBox_yTextAlign.valueChanged.connect(self.update)
        page.spinBox_fontSize.valueChanged.connect(self.update)
        page.lineEdit_textColor.textChanged.connect(self.update)
        self.page = page
        return page

    def update(self):
        self.title = self.page.lineEdit_title.text()
        self.alignment = self.page.comboBox_textAlign.currentIndex()
        self.titleFont = self.page.fontComboBox_titleFont.currentFont()
        self.fontSize = self.page.spinBox_fontSize.value()
        self.xPosition = self.page.spinBox_xTextAlign.value()
        self.yPosition = self.page.spinBox_yTextAlign.value()
        self.textColor = self.RGBFromString(
            self.page.lineEdit_textColor.text())
        self.parent.drawPreview()
        super().update()

    def getXY(self):
        '''Returns true x, y after considering alignment settings'''
        fm = QtGui.QFontMetrics(self.titleFont)
        if self.alignment == 0:             # Left
            x = self.xPosition

        if self.alignment == 1:             # Middle
            offset = fm.width(self.title)/2
            x = self.xPosition - offset

        if self.alignment == 2:             # Right
            offset = fm.width(self.title)
            x = self.xPosition - offset
        return x, self.yPosition

    def loadPreset(self, pr, presetName=None):
        super().loadPreset(pr, presetName)

        self.page.lineEdit_title.setText(pr['title'])
        font = QFont()
        font.fromString(pr['titleFont'])
        self.page.fontComboBox_titleFont.setCurrentFont(font)
        self.page.spinBox_fontSize.setValue(pr['fontSize'])
        self.page.comboBox_textAlign.setCurrentIndex(pr['alignment'])
        self.page.spinBox_xTextAlign.setValue(pr['xPosition'])
        self.page.spinBox_yTextAlign.setValue(pr['yPosition'])
        self.page.lineEdit_textColor.setText('%s,%s,%s' % pr['textColor'])
        btnStyle = "QPushButton { background-color : %s; outline: none; }" \
            % QColor(*pr['textColor']).name()
        self.page.pushButton_textColor.setStyleSheet(btnStyle)

    def savePreset(self):
        return {
            'preset': self.currentPreset,
            'title': self.title,
            'titleFont': self.titleFont.toString(),
            'alignment': self.alignment,
            'fontSize': self.fontSize,
            'xPosition': self.xPosition,
            'yPosition': self.yPosition,
            'textColor': self.textColor
        }

    def previewRender(self, previewWorker):
        width = int(previewWorker.core.settings.value('outputWidth'))
        height = int(previewWorker.core.settings.value('outputHeight'))
        return self.addText(width, height)

    def preFrameRender(self, **kwargs):
        super().preFrameRender(**kwargs)
        return ['static']

    def frameRender(self, moduleNo, arrayNo, frameNo):
        width = int(self.worker.core.settings.value('outputWidth'))
        height = int(self.worker.core.settings.value('outputHeight'))
        return self.addText(width, height)

    def addText(self, width, height):
        x, y = self.getXY()
        im = self.blankFrame(width, height)
        image = ImageQt(im)

        painter = QPainter(image)
        self.titleFont.setPixelSize(self.fontSize)
        painter.setFont(self.titleFont)
        painter.setPen(QColor(*self.textColor))
        painter.drawText(x, y, self.title)
        painter.end()

        imBytes = image.bits().asstring(image.numBytes())

        return Image.frombytes('RGBA', (width, height), imBytes)

    def pickColor(self):
        RGBstring, btnStyle = super().pickColor()
        if not RGBstring:
            return
        self.page.lineEdit_textColor.setText(RGBstring)
        self.page.pushButton_textColor.setStyleSheet(btnStyle)

    def commandHelp(self, arg):
        print('Enter a string to use as centred white text. '
        'Use quotes around the string to escape spaces.')

    def command(self, arg):
        if not arg.startswith('preset='):
            self.title = arg
            return True
        super().command(arg)